Tappet Noise (Lifter Tick)

It is common for a few seconds after a cold start until oil reaches hydraulic lifters. Constant ticking can mean worn lifters, too much valve clearance or low oil level. Engines with mechanical tappets need clearance checks at service intervals. Hydraulic lifters can clog with sludge if oil changes are neglected. A mechanic can locate the noisy lifter with a stethoscope or by checking clearances.

When there is a gap between the cam, lifter and valve, the parts strike each other each time the valve opens.

Check oil level and grade first, since thick or low oil makes lifters noisy. Ignored tappet noise can lead to camshaft wear.